Spring construction



May 12 1936. J. KlRsTElN SPRING CONSTRUCTION Filed NOV. 6, 1954 JACOB KIRSTEN 9% I .fiiiol'nqy Patented May 12, 1936 UNITED STATES PATENT OFFICE Bunting Glider Company, Philadelphia, Pa., a corporation of Pennsylvania Application November 6, 1934, Serial No.

5 Claims.

This invention relates to coil springs and more particularly to improvements in the design and construction of the anchoring extermities thereof.

the spring from the structure to which it is attached, this means being in the form of what may be termed a double-lock connecting loop.

Another object of the invention is the provision in a coil spring of an anchoring form of a loop of such shape that when properly attached to a supporting structure the loop funcsuring a relatively fixed position of the spring with respect to its supporting structure, this being a condition which is much to be desired because when the permissible angular displacement of the spring is relatively unlimited the possibility of the spring end becoming disengaged from the structure to which it is attached is greatly increased.

Still another object of the present invention is the provision of an anchoring loop at one or both extremities of a coil that the terminal end of the spring wire is disposed within the circumference of the coil, thus utilized for interconnecting the spiral springs of a fabric-covered spring foundation unit commonly employed in beds, swings, couches and seats generally.

Other objects and advantages of the invention will be apparent from the detailed description which follows:

The invention consists substantially in the combination, construction, location and relative arrangement of parts, all as described more fully hereinafter, as shown in the accompanying drawing and as finally pointed out in the appended claims. In the said accompanying drawing only two general applications are illustrated of the coil spring as constructed in accordance with the it being understood, of course,

5 other.

In the said accompanying drawing:- Figure 1 is a plan view of a foundation unit in which the between the spiral springs;

Figure 2 is a View showing the first position of the anchoring extremity of the coil spring with respect to the supporting structure for the spring;

Figure 3 is a view showing the second and final position of the anchoring extremity with respect to said structure;

Figure 4 is a view taken on the line 4-4 of Figures 1 and 2;

Figure 5 is a Figures 1 and 3;

Figures 6 and 7 are end the connecting positions and 3;

Figure 8 is a vertical sectional View taken on the line 88 of Figure 1; and

Figure 9 is a view showing the adaptability of the coil spring of the present invention to another use than that illustrated in Figure 1.

Referring now to the drawing and more particularly to Figures 1 to 7 thereof, it will be observed that for purposes of illustration coil springs as constructed in accordance with the present invention are shown employed as connectors between the spiral springs of a spring foundation unit I!) such as is commonly employed in beds, swings, couches and seats generally. The

View taken on the line 55 of views respectively of shown in Figures 2 by the reference numeral H, are each characterized by the provision at each end thereof of an anchoring device l2 substantially in the form of the figure 8 when viewed axially of the spring, this configuration of the anchoring extremity being best shown in Figures 6 and 7 of the drawing.

The anchoring extremity I2 is, of course, formed as an integral part of the coil spring II, and as a matter of fact is obtained by so distorting the end convolution of the coil spring as to provide a looped section E3 the bight I4 of which lies substantially in the axis this bight l4 being further spaced outwardly from the plane of the endmost regular convolutionv I5. The terminal end section iii of the looped section I3 is turned inwardly of the circumference of the coil spring and thence outwardly of the coil spring substantially in the direction of its axis, in consequence of which the terminal end I! of the loop is located at a point disposed within the circumference of the coil spring and between the plane of the endmost double lock against the accidental displacement convolution I5 and the aforesaid bight ll. of the spring from its support. The invention is, Actually, by constructing the anchoring exof course, susceptible of various changes and tremity in the manner just described and as modifications without departing from the real shown in the accompanying drawing, there is spirit or general principles thereof and it is in- 5 produced a double-looped anchoring extremity tended therefore to claim the same broadly, as wherein, in addition to the bight I4, there are wellas specifically, as indicated in the appended the bights I8 and I9, as shown more clearly in claims. Figures 6 and 7, each of these latter bights be- What is claimed as new and useful is:- ing a part of a separate loop. At this point at- 1. A coil spring of the character described tention is directed to this important feature of wherein the endmost convolution is deformed the construction, namely, that the terminal end from its normal shape to P v de areversely bent I! of the double-loop is spaced from the bight portion terminating i an p 9 lying in a. l8 (see space a, in Figures 7 and 8) a, distance plane inclined with respect to the coil axis, the substantially equal to the space b between the free na d of Said 1001) being Spaced from bight I9 and the aforesaid endmost convolution the bight 0f Said reVerSelY bent P0111011 a I5 of the coil spring. tance substantially equal to that intervening Preferably, the distances a and b are each less b we bight 0f Said 0138111100!) and the than the overall dimension of the member to m n rmal c nvo ution of h c i p in which the end of the coil spring is to be secured. A 0011 Spring of the Character described 0 In other words, in the case of the arrangement h ving an anchoring extremity in at least One d Shown in Figure 1, the diameter of the i thereof in the form of an integral continuation 1. Thereafter, the coilspring is twisted through part disposed in plane OPPO through the space a provided between the terminal end I! of the anchoring loop and the bight c It will be observed that in its final position, the wire 20 constituting the support commonly prolimit the degree of permissible angular displaceposed interiorly of the circumference of the coil spring extremity is substantially eliminated.

forming the spiral springs of the spring founda- 0f the wire forming the normal convolutions of tion unit In is greater than either of the spaces the p n a w r n inuati n i lud n a a and b aforesaid, in consequence of which the Portion bent outwardly from the adjoining end doub1e 1ooped anchoring extremity of the coil convolution, thence diametrically across the k spring must be sprung Over t upporting wire end convolution, thence inwardly toward the end of the spiral pring at, two uccessive points be.. convolution, and thence interiorly of the Col]. cirfor it is propel-1y secured in position cumference to a point disposed within and spaced To anchor the extremity of the coil spring in from S id circumference. to position upon the spiral spring, the wire 20 form- A 00 Spring having an anchoring extremity ing the latter is first passed through the space b the m of an mtegral contmuajtlon of the provided between the bight I9 and the endmost formmg the normal f P of the regular convolution I5 of the coil spring, the Spring Said wire ccfntinuatl'on including 3 relative arrangement of the parts being then as vefsely bent part dlsPosedg a Plane Inclined i5 Shown in Figures 2 4 and 6 and as at c in Figure with respect to the co 1 axis and a hook-shaped sitely inclined with respect to said coil axis, the free terminal end of approximately a ninety degree angle and the wire said hook-shaped part being disposed interiorly 20 forming the spiral spring is then passed 4. A coil spring of the character defined in claim 3 wherein the said reversely bent part and the hook-shaped part are joined together at a point spaced outwardly from the endmost normal I8 thereof; the relative arrangement of the wire 20 and the anchoring loop being then as shown in Figures 3, 5, 7, and 8 and at d in Figure 1.

tially in the locus of the coil axis.

5. A coil spring of the character described wherein at least one extremity thereof is provided with a pair of loops formed in continuation jects through both loops of the anchoring extremity, the arrangement being such that the bights I8 and I9 of the two loops respectively spectively arranged substantially at diametrically opposed points in the coil circumference, the said loops being disposed in planes inclined with respect to each other and being joined together ment of the coil spring relatively to its supporting member, for example, the wire 20 of Figures 1 et seq. Moreover, it will be observed the terminal end ll of the anchoring loop is so discommon branch of the joined loops being outwardly humped substantially at the locus of the coil axis to provide a third bight projecting axially outwardly of the coil spring, the first of spring, that all danger of its engaging and so damaging tearable material which may be employed to cover the foundation unit or which may be in the immediate proximity of the coil hort of and in spaced relation to the bight of The coil spring of the present invention is, S

the second of said loops to afford an entrance to of course adapted to a wlde apphca'twn and 15 said first loop, and the bight of the said first loop not at all confined to the use illustrated in Fighem corms ndm 1 s aged fro m the endmost ure 1. Thus, it may be employed as in Figure 9 g p0 g y p as a spring support for various devices, the double-loop anchoring extremity 2I thereof functioning exactly as described above to provide a I JACOB KIRSTEIN.

an. entrance to the second of said loops.

of the circumference of the coil spring. 4o

convolution of the spring and located substan- Q5 of one another and with the bights thereof re- 50,

substantially in. the locus of said coil axis, the

said loops having a free terminal end terminating normal convolution of the coil spring to afford 

